Blow-off valve for steam-boilers.



PATENTED AUG. 7, 1906.

J. KLOPFER. BLOW-OFF ALVE FOR STEAM BOILERS.

ar'ruonmn FILED-10110.21, 1905.

- UNITED STATES- PATENT OFFICE.

BLOW-OFF VALVE FOR STEAM-BOILERS.

Specification of Letters Patent.

Patented Aug. 7, 1906.

Applioation filed December 21,1905. Serial No. 292,682.

To all whom, it may concern:

Be it known that I, JOSEPH KLOPFER, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Blow-Off Valves vertical central section with the valve open Fig. 3, a vertical section at right angles to the section shown in Fig. 2.

This invention relates to an improvement in blow-off valves for steam-boilersthat is, a valve which may be connected with the tubes which when open permits the contents of the same to be discharged, and while particularly adapted for this object the valve may be used for other purposes.

The object of the invention is to construct a valve which shall have a straight opening or passage and which when closed will remain tight and withstand necessary pressure and also one which practically prohibits the possibility of any scale getting into the valve-seat and the invention consists in the construction as hereinafter described, and particularly recited in the claims.

In carrying out my invention I employ a body 2 of any desired form externally, having a central chamber 3, a transverse passage intersecting the chamber 3 and forming passages 4 and 5 on opposite sides thereof, the passage 4 being adapted for connection to a pipe from the boiler and an opening 5providing an outlet for sediment when discharged from the boiler. Within the chamber is a cylindrical piston or valve 6, closely fitting the chamber and formed with a transverse port 7, which registers with the passages, 4 and 5 when the valve is raised, or to close these passages or openings when the valve is lowered. This piston is swivelly connected with a screw-stem'8, engaged in a bonnet 9, coupled with the upper end of the body 3 and provided at its upper end with the usual end piece 10, by which the screw may be turned so as to raise or lower the piston. In one side of the piston is a slot 11, having an incline 12 at its upper end. Into this slot extends a screw-plug 13, which holds the piston against rotation, yet permits it to be raised or lowered. The bottom 14 of the piston is tapered, and into the lower end of the chamber 3 is inserted a plug 15, having a tapered upper end 16, corresponding to the taper 14 at the bottom of the valve. Preferably, and as herein shown, a assage 17 extends through the plug, to w 'ch a petcock 18 is attached.

While I have shown a bonnet attached to the upper end of the .body for the engagement of the spindle, it is apparent without illustration that the bonnet might be formed integral with the body.

The valve being coupled with the boiler, if it is desired to draw off the sediment the piston will be raised so that the port 7 connects the passages 4 and 5, allowing the sediment to escape from the boiler. the valve is closed by forcing the piston 6 downward, so that the port 7 is in a line below the passages 4 and 5. At this time the beveled surface 14 comes in contact with the bevel 16 at the upper end of the plug and crowds the piston to one side of the chamber, so as to hold it in close contact therewith, thus insuring a tight joint. At the same time when the beveled surfaces 14 and 16 are in contact the incline 12 in the up er end of the slot 11 bears against the end of the screw 13, and this inclination tends to force the piston against one side of the chamber, further insuring a tight joint. By arranging the port 7 to register with the passages 4 and 5 the piston acts as a cutter or shears to break any pieces of scale which may remain When cleaned,

in the passages and prevent them from en- 5 tering or obstructing the seat of the valve. Although wear is slight and when assembled the piston will closely fit the cylinder, more or less play must exist between the piston and the interior walls of the cylinder, and this play will be taken up by the inclines at the bottom of the cylinder and at the upper end of the cylinder. The purpose of the etcock 18 is to overcome any vacuum whic might be created between the top of the plug and the lower end of the piston. By constructing the iston with a transverse port to register wit the openings the lower end of the piston is never raised above the ports, so that scale and sediment cannot enter below the piston, and hence enter the valve-seat, so as to prevent the piston from tightly closing. claiIn 1. A blow-off valve comprising a circular chamber the passages opening into opposite sides thereof, a piston in said chamber and vertically movable therein, said piston having a transverse port adapted to register with said 0 enings and formed at its bottom with an inclined face and an inclined face arranged at the bottom of the chamber to coact with the inclination on the piston when the valve is closed, substantially as described.

2. A blow-off valve comprising a cylindrical chamber, passages opening into said chamber on opposite sides thereof, a vertically-movable piston within said chamber and formed with a port adapted, when the piston is in its raised position, to connect said passages and to close the same when the piston is lowered, means for raising and lowering said piston, a groove in one side of the piston having an inclined upper end, a stud entering said groove whereby the piston is held against rotation, said piston formed at its lower end with an inclined face, and a plug entered into the lower end of the chamber and having an inclined upper end corresponding to the inclined lower end of the piston, substantially as described.

3. A blow-off valve comprising a cylindrical chamber, passages opening into said chamber on opposite sides thereof, a vertically-movable piston within said chamber and formed with a port adapted, when the piston is in its raised position, to connect said passages and to close the same when the piston is lowered, means for raising and lowering said piston, a groove in one side of the piston having an inclined upper end, a stud entering said groove whereby the piston is held against rotation, said piston formed at its lower end with an inclined face, a plug en- 'tered into the lower end of the chamber and having an inclined upper end corresponding to the inclined lower end of the piston, a assage through said plug, and a cock toc ose the same, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JOSEPH KLOPFER.

Witnesses:

N. W. KENDALL. HENRY MUsoH. Jr. 

